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My car starts but has a knocking noise. And every once in a while it idles out.
Hello. It sounds like there may be something inside the engine that is worn out or broken. This will cause a knocking noise and could also cause the truck to shut off. A compression test checks the compression of each cylinder, and can help to identify the problem in your engine. I would recommend having a certified mechanic inspect your vehicle's knocking noise in order to have this issue resolved.
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